Atroposelectivity of Reactions of Benzylic Metalated Thiobenzamides and Thionaphthamides
作者:David Ach、Vincent Reboul、Patrick Metzner
DOI:10.1002/ejoc.200300233
日期:2003.9
chirality was evidenced. Benzylic deprotonation of thioamides bearing N,N-diisopropyl groups with sec-butyllithium was selective. The resulting anions were reacted with prochiral electrophiles (aromatic aldehydes, an unsaturated aldehyde or ketone, and an imine) to afford diastereomeric adducts (up to 88:12 dr). This is the first report on atroposelective C−C bond formation in the benzylic position of thioamides
N,N-二烷基-2-甲基苯硫代碳酰胺和萘碳硫代酰胺是通过在不寻常的条件下用劳森试剂对酰胺进行硫化来制备的。证明了它们的轴向手性。带有 N,N-二异丙基的硫代酰胺与仲丁基锂的苄基去质子化是选择性的。所得阴离子与前手性亲电试剂(芳香醛、不饱和醛或酮和亚胺)反应,得到非对映加合物(高达 88:12 dr)。这是关于在硫代酰胺的苄基位置形成阻转选择性 C-C 键的第一份报告。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)