Total Synthesis of the Four Enantiomerically Pure Diastereomers of 8-F_2t-Isoprostane

Syntheses of the four enantiomerically pure diastereomers of 8-F2t-isoprostane (5−8) are described. The key to this approach was to prepare the racemic alcohol 9 in high diastereomeric purity and then resolve 9 by lipase-mediated acetylation to yield the enantiomerically pure alcohols 30 and 32

Total Synthesis of the Four Enantiomerically Pure Diastereomers of 8-F_2t-Isoprostane

Syntheses of the four enantiomerically pure diastereomers of 8-F2t-isoprostane (5−8) are described. The key to this approach was to prepare the racemic alcohol 9 in high diastereomeric purity and then resolve 9 by lipase-mediated acetylation to yield the enantiomerically pure alcohols 30 and 32

Use of in Situ Isopropoxide Protection in the Metal−Halogen Exchange of Arylboronates

Isopropoxide protection of arylboronates allowed their use in metal−halogen exchange reactions. The isopropoxide-protected borate species were obtained from a boronate or in situ from dibromoarenes. meta- and para-dibromoarenes were converted via these intermediates into functionalized arylboronates in a one-pot manner

Total Synthesis of (+)-Quassin

A total synthesis of (+)-quassin from naturally occurring (S)-(+)-carvone is described. The total number of steps was 28, and the overall yield was about 2.6%. The synthetic strategy for the construction of the tetracyclic carbon framework was based on a C→ABC→ABCD ring annulation sequence, involving an aldol reaction, an intramolecular Diels−Alder reaction, and an intramolecular acylation as the key steps. Subsequent functionalization of ring A and ring C then afforded the target (+)-quassin

Total Synthesis of (+)-Quassin

A total synthesis of (+)-quassin from naturally occurring (S)-(+)-carvone is described. The total number of steps was 28, and the overall yield was about 2.6%. The synthetic strategy for the construction of the tetracyclic carbon framework was based on a C→ABC→ABCD ring annulation sequence, involving an aldol reaction, an intramolecular Diels−Alder reaction, and an intramolecular acylation as the key steps. Subsequent functionalization of ring A and ring C then afforded the target (+)-quassin

Use of in Situ Isopropoxide Protection in the Metal−Halogen Exchange of Arylboronates

Isopropoxide protection of arylboronates allowed their use in metal−halogen exchange reactions. The isopropoxide-protected borate species were obtained from a boronate or in situ from dibromoarenes. meta- and para-dibromoarenes were converted via these intermediates into functionalized arylboronates in a one-pot manner

Total Synthesis of (+)-Quassin from (+)-Carvone^†

Total Synthesis of (+)-Quassin from (+)-Carvone†</sup

Total Synthesis of (+)-Quassin from (+)-Carvone^†

Total Synthesis of (+)-Quassin from (+)-Carvone†</sup

DataSheet_1_Causal relationships between blood metabolites and diabetic retinopathy: a two-sample Mendelian randomization study.docx

BackgroundDiabetic retinopathy (DR) is a microvascular complication of diabetes, severely affecting patients’ vision and even leading to blindness. The development of DR is influenced by metabolic disturbance and genetic factors, including gene polymorphisms. The research aimed to uncover the causal relationships between blood metabolites and DR.MethodsThe two-sample mendelian randomization (MR) analysis was employed to estimate the causality of blood metabolites on DR. The genetic variables for exposure were obtained from the genome-wide association study (GWAS) dataset of 486 blood metabolites, while the genetic predictors for outcomes including all-stage DR (All DR), non-proliferative DR (NPDR) and proliferative DR (PDR) were derived from the FinnGen database. The primary analysis employed inverse variance weighted (IVW) method, and supplementary analyses were performed using MR-Egger, weighted median (WM), simple mode and weighted mode methods. Additionally, MR-Egger intercept test, Cochran’s Q test, and leave-one-out analysis were also conducted to guarantee the accuracy and robustness of the results. Subsequently, we replicated the MR analysis using three additional datasets from the FinnGen database and conducted a meta-analysis to determine blood metabolites associated with DR. Finally, reverse MR analysis and metabolic pathway analysis were performed.ResultsThe study identified 13 blood metabolites associated with All DR, 9 blood metabolites associated with NPDR and 12 blood metabolites associated with PDR. In summary, a total of 21 blood metabolites were identified as having potential causal relationships with DR. Additionally, we identified 4 metabolic pathways that are related to DR.ConclusionThe research revealed a number of blood metabolites and metabolic pathways that are causally associated with DR, which holds significant importance for screening and prevention of DR. However, it is noteworthy that these causal relationships should be validated in larger cohorts and experiments.</p

Enantiomerically Pure Cyclohexenones by Fe-Mediated Carbonylation of Alkenyl Cyclopropanes

Enantiomerically Pure Cyclohexenones by Fe-Mediated Carbonylation of Alkenyl Cyclopropane