作者:Robert A Stalker、Tamara E Munsch、Jacquelyn D Tran、Xiaoping Nie、Ralf Warmuth、Alicia Beatty、Christer B Aakeröy
DOI:10.1016/s0040-4020(02)00450-7
日期:2002.6
asymmetric reductive amination protocol using (R)-phenylglycinol as a chiral amino auxiliary and NaBH(OAc)3 as a reducing agent. Using this procedure, the asymmetric reductive amination of α-tetralone derivatives and indanone proceeds with >95% de. Lower diastereomeric excesses are observed for benzosuberone (16.7% de) and acetophenone (27.3% de). rac-21 gave (1′S,8′S,1(R)-25a (38% yield) and (1′R,8′S,1(R)-25b
构象约束的l-和d-赖氨酸衍生物甲基(1 S,8 S)-1-氨基-8-叔丁氧基羰基氨基-1,2,3,4,5,6,7,8-八氢蒽的不对称合成-1-羧酸盐(4)和甲基(1 R,8 S)-1-氨基-8-叔丁氧基羰基氨基-1,2,3,4,5,6,7,8-八氢蒽-1-羧酸盐(5)分别进行说明。Bucherer乙内酰脲合成对2',3',4',5',6',7'-六氢螺[1,3-乙撑二硫基-2,1'-蒽] -8'-one(18),它是由1,8-二氯蒽醌(14)分九步制备的,并脱保护了18的被掩盖的第二酮产生rac -21。后者是使用(R)-苯基甘氨醇作为手性氨基助剂和NaBH(OAc)3作为还原剂的新型不对称还原胺化方案的前体。使用该程序,α-四氢萘酮衍生物和茚满酮的不对称还原胺化反应的de> 95%。苯并亚砜(16.7%de)和苯乙酮(27.3%de)的非对映异构体过量较低。rac -21得到(1 'S,8