トウキョウノウギョウダイガクアツギキャンパス ニ オケル ショクブツタヨウセイ ノ ホゼン

神奈川県厚木市に位置する東京農業大学厚木キャンパスにおいて,約30年間の植物相の変化を明らかにするため,1976年と2004年に行われた維管束植物相の調査結果を比較検討した。その結果,厚木キャンパスの維管束植物相は,1976年に462分類群が,2004年に418分類群が確認された。両調査で確認された出現種を比較したところ,194分類群の植物が消失したことが明らかになった。消失した植物のうち167分類群が在来植物であり,12種の絶滅危惧種が含まれていた。一方,1976年に確認された植物のうち,235分類群の在来植物が2004年においても確認された。これらの在来植物はキャンパス内に残された雑木林や草地などを生育場所とし,絶滅危惧種であるキンラン及びカタクリはクヌギ-コナラ林に確認された。厚木キャンパスにおける植物多様性の保全には,これらの雑木林や草地などの的確な保全が必要である。The vascular flora of the Atsugi campus of Tokyo University of Agriculture in 2004 was compared with that in 1976. 462 taxa were recorded in 1976, while 418 taxa in 2004. 194 taxa which were recorded in 1976, could not be found in 2004. Among 194 plants, 167 were native, including twelve endangered species. In contrast, 235 taxa confirmed in 1976 were also confirmed in 2004. Most of the native species in the flora in 2004, including two endangered species, Erythronium japonicum (Liliaceae) and Cephalanthera falcata (Orchidaceae), were recorded from the woodlands and grasslands on the campus. To maintain plant diversity on the campus, conservation of the woodlands and grasslands is needed

トウキョウノウギョウダイガクアツギキャンパス ニ オケル ハンシゼンソウチ ノ ショクセイカンリ ノ タメニ ショウジル カリクサ ノ タイヒリヨウ (I) カリクサ ニ フクマレル シュシ ノ シメツ ニ オヨボス オンド ト カオンニッスウ ノ エイキョウ

神奈川県に位置する東京農業大学厚木キャンパスは半自然草地が残されている。資源循環型農業をキャンパス内ですすめるために,これらの草地の植生管理によって生じる刈り草を堆肥化した際,刈り草に含まれる種子の死滅に及ぼす温度と加温日数の影響を明らかにした。キャンパス内に生育するスイバRumex acetosa L., ギシギシRumex japonicus Houtt.(タデ科Polygonaceae),アブラナBrassica rapa L.(アブラナ科Curcifere)およびイヌムギBromus catharticus Vahl(イネ科Poaceae)の4種の種子を用い実験した結果,40℃,45℃および55℃の加温では,すべての種において加温処理日数が長くなるに連れて発芽率は低下した。また,加温処理温度が高くなるに連れてすべての種で発芽率は低下した。60℃温度区では4種すべてにおいて加温処理日数1日で全く発芽が観察されなかった。Semi-natural grasslands remain on the Atsugi Campus of Tokyo University of Agriculture. To manage the vegetation of the grasslands, the grass is periodically cut. Composting the grass cuttings on campus is sound recycling practice. The compost can then be used as a soil supplement to improve agriculture. We conducted this study to examine the effect of temperature and duration of heat exposure on weed seed viability in the cut grass. Four species, Rumex acetosa L., Rumex japonicus Houtt., Brassica rapa L. and Bromus catharticus Vahl, which commonly occur in semi-natural grasslands on the campus in the spring, were selected for study. The rate of germination of each species decreased after long exposure to heat when treated at 40℃, 45℃ and 55℃. The seeds of all four species were killed by exposure to temperatures of 60℃ for one day

Stereocontrolled Synthesis of Substituted Chiral Piperidines via One-Pot Asymmetric 6π-Azaelectrocyclization: Asymmetric Syntheses of (−)-Dendroprimine, (+)-7-Epidendroprimine, (+)-5-Epidendroprimine, and (+)-5,7-Epidendroprimine

The asymmetric one-pot 6π-azaelectrocyclization of alkenyl vinyl stannane, ethyl (<i>Z</i>)-2-iodo-4-oxobutenoate, and (−)-7-isopropyl-<i>cis</i>-aminoindanol in the presence of a Pd(0) catalyst stereoselectively produced the tetracyclic aminoacetal compounds, resulting from the four-bond formation accompanying by controlling the stereochemistry at the two asymmetric centers. The produced cyclic aminoacetals can be regarded as synthetic precursors of substituted chiral piperidines, and the syntheses of 2,4- and 2,4,6-substituted piperidines were realized from the obtained aminoacetals by the stereoselective hydrogenation of the double bond conjugated with the C-4 ester group and alkylation at the aminoacetal moiety. In addition, the stereoselective synthesis of an indolizidine alkaloid, (−)-dendroprimine, and its three stereoisomers, (+)-7-epidendroprimine, (+)-5-epidendroprimine, and (+)-5,7-epidendroprimine, were achieved

Stereocontrolled Synthesis of Substituted Chiral Piperidines via One-Pot Asymmetric 6π-Azaelectrocyclization: Asymmetric Syntheses of (−)-Dendroprimine, (+)-7-Epidendroprimine, (+)-5-Epidendroprimine, and (+)-5,7-Epidendroprimine

The asymmetric one-pot 6π-azaelectrocyclization of alkenyl vinyl stannane, ethyl (<i>Z</i>)-2-iodo-4-oxobutenoate, and (−)-7-isopropyl-<i>cis</i>-aminoindanol in the presence of a Pd(0) catalyst stereoselectively produced the tetracyclic aminoacetal compounds, resulting from the four-bond formation accompanying by controlling the stereochemistry at the two asymmetric centers. The produced cyclic aminoacetals can be regarded as synthetic precursors of substituted chiral piperidines, and the syntheses of 2,4- and 2,4,6-substituted piperidines were realized from the obtained aminoacetals by the stereoselective hydrogenation of the double bond conjugated with the C-4 ester group and alkylation at the aminoacetal moiety. In addition, the stereoselective synthesis of an indolizidine alkaloid, (−)-dendroprimine, and its three stereoisomers, (+)-7-epidendroprimine, (+)-5-epidendroprimine, and (+)-5,7-epidendroprimine, were achieved