Enantioselective Construction of Vicinal Stereogenic Quaternary Centers by Dialkylation: Practical Total Syntheses of (+)- andmeso-Chimonanthine
作者:Larry E. Overman、Jay F. Larrow、Brian A. Stearns、Jennifer M. Vance
DOI:10.1002/(sici)1521-3773(20000103)39:1<213::aid-anie213>3.0.co;2-z
日期:2000.1.3
3a'-bispyrrolidino[2,3-b]indoline moiety found in complex indole alkaloids can be prepared, as illustrated by total syntheses of meso-chimonanthine (1) and (+)-chimonanthine (2). A rare example of high diastereoselectivity arising from the combination of a prostereogenic enolate with a chiral electrophile containing a sp(3) carbon atom is the key feature of the asymmetric synthesis of the C(2) stereoisomer.
可以制备在复杂的吲哚生物碱中发现的六种环状3a,3a'-双吡咯烷并[2,3-b]吲哚啉部分的所有三种立体异构体,如中消旋鸟嘌呤(1)和(+)-鸟嘌呤(2)的总合成所示。 )。C(2)立体异构体不对称合成的关键特征是,由非甾体烯醇酸酯与含有sp(3)碳原子的手性亲电试剂的结合引起的高非对映选择性的罕见例子。