作者:Lutz Tietze、Christian Stadler、Niels Böhnke、Gordon Brasche、Alexander Grube
DOI:10.1055/s-2007-967937
日期:2007.2
synthesis of the enantiomerically pure cis-annulated cyclopentenes 2 and ent-2 was established by the use of an enzymatic transesterification and hydrolysis, respectively, followed by an S N 2-type substitution with a benzyloxymethyl cuprate and a sigmatropic rearrangement. The advantage of this approach is the short sequence combined with an excellent overall yield and an enantiomeric excess of 99%.
对映异构纯顺式环戊烯 2 和 ent-2 的有效合成分别通过使用酶促酯交换和水解,然后用苄氧基甲基铜酸盐和 sigmatropic 重排进行 SN 2 型取代。这种方法的优点是序列短,总产率高,对映体过量达 99%。