Ligand-controlled Regioselective Cu-Catalyzed Trifluoromethylation to Generate Trifluoromethylallenes

“Cu–CF3” species have been used historically for a broad spectrum of nucleophilic trifluoromethylation reactions. Although recent advancements have employed ligands to stabilize and harness the reactivity of this key organometallic intermediate, the ability of a ligand to differentiate a regiochemical outcome of a Cu–CF3-mediated or -catalyzed reaction has not been previously reported. Herein, we report the first example of a Cu-catalyzed trifluoromethylation reaction in which a ligand controls the regiochemical outcome. More specifically, we demonstrate the ability of bipyridyl-derived ligands to control the regioselectivity of the Cu-catalyzed nucleophilic trifluoromethylation reactions of propargyl electrophiles to generate trifluoromethylallenes. This method provides a variety of di-, tri- and tetra-substituted trifluoromethylallenes, which can be further modified to generate complex fluorinated substructures

Should Sentinel Lymph Node Biopsy for Patients with Early Breast Cancer be Abandoned? Not So Fast

As major advances are made in the management of early breast cancer, the role of sentinel lymph node biopsy (SLNBx) has been called into question. However, before abandoning SLNBx, a critical appraisal of its role should be done because we believe that it remains a critical component of care, especially when tailoring patient's adjuvant therapy. This commentary provides cogent arguments in favor of SLNBx in the management of patients with early breast cancer

Recurrent Malignant Melanoma Presenting as Isolated Pleural Metastases in a Patient with Chronic Lymphocytic Leukemia

Isolated pleural metastasis with pleural effusion is a rare occurrence in malignant melanoma. We report an unusual case of a patient with chronic lymphocytic leukemia (CLL) and recurrent pleural effusions. The pleural fluid cytology and immunohistochemistry profile were consistent with the diagnosis of CLL. However, chemotherapy with pentostatin, cyclophosphamide, and rituximab did not result in any meaningful clinical response. A video-assisted thoracoscopic surgery and biopsy of the affected nodular parietal layer of the pleura were consistent with malignant melanoma. Our case underlines the importance of having a suspicion for secondary causes of effusion in patients with CLL. We briefly discuss the mechanisms of an increased incidence of secondary cancers in CLL and the diagnosis of isolated pleural metastases in malignant melanoma

Poor Survival in Stage IIB/C (T4N0) compared to Stage IIIA (T1-2N1, T1N2a) Colon Cancer Persists Even after Adjusting for Adequate Lymph Nodes Retrieved and Receipt of Adjuvant Chemotherapy

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