Asymmetric Propargylboration of Aldimines and Ketimines with the Borabicyclo[3.3.2]decanes: Novel Entries to Allenyl Carbinamines, Amino Acids, and Their α-Methyl Counterparts
作者:Eyleen Alicea-Matías、John A. Soderquist
DOI:10.1021/acs.orglett.6b03506
日期:2017.1.20
Available in either enantiomerically pure form through quantitative Grignard procedures from air-stable crystalline complexes (1, 3), the B-γ-TMS propargylic derivatives of the 10-TMS- (2) and 10-phenyl-9-borabicyclo[3.3.2]decanes (4) provide highly selective entries to 2°-allenyl carbinamines (8, 60–85%, 78–99% ee) and their 3° counterparts (13, 62–82%, 95–99% ee) through their additions to aldimines
通过从空气稳定的结晶复合物(定量格利雅程序可用在任一对映体纯的形式1,3)时,乙-γ-TMS 10 TMS-(的炔衍生物2)和10-苯基-9-硼二环[3.3。 2]癸烷(4)提供高度选择性的条目,以2°-allenyl carbinamines(8,60-85%,78-99%ee)和它们的3°同行(13,62-82%,95-99%ee)的通过它们分别添加到醛亚胺和酮亚胺中。这些胺的绝对构型是通过8e的臭氧分解反应从已知的氨基酸衍生物16e R和19d R获得的R和13d R以及14f R的单晶X射线结构。