作者:Xiaotao Pu、Dawei Ma
DOI:10.1021/jo0341261
日期:2003.5.1
gamma-amino alcohols 7 and 18 are prepared by using the diastereoselective Michael addition of lithium N-benzyl (R)-alpha-methylbenzylamide to alpha,beta-unsaturated esters as a key step. The Michael addition of 7 or 18 to an alkynone 8 followed by an intramolecular cyclization afford the cyclic enamine 10 or 20, which are subjected to the diastereoselective hydrogenation, and the subsequent transformations
通过使用N-苄基(R)-α-甲基苄基锂的锂的非对映选择性迈克尔加成到α,β-不饱和酯上来制备对映体纯的γ-氨基醇7和18。将7或18的迈克尔加成到炔基8上,然后进行分子内环化,得到环状烯胺10或20,将其进行非对映选择性氢化,随后的转化分别提供6-表生物碱223A和生物碱223A。