Asymmetric radical cyclizations: the synthesis of 6-Alkyl Pyrrolizidin-2-ones
摘要:
This work describes the use of ethyl (5S)-carboethoxy-2-pyrrolidinone (ethyl pyroglutamate) as a chiral starting material for use in radical cyclization reactions. Pyroglutamate is converted to a 5-iodomethyl-N-allylic-2-pyrrolidinone that undergoes radical cyclization under mild conditions. The products are 6-substituted pyrrolizidinone derivatives, produced with high diastereoselectivity.
Asymmetric synthesis of pyrrolizidinones by radical cyclization of N-allylic pyroglutamates
作者:Paul F. Keusenkothen、Michael B. Smith
DOI:10.1016/s0040-4039(00)99247-5
日期:1989.1
KEUSENKOTHEN, PAUL F.;SMITH, MICHAEL B., TETRAHEDRON LETT., 30,(1989) N6, C. 3369-3372
作者:KEUSENKOTHEN, PAUL F.、SMITH, MICHAEL B.
DOI:——
日期:——
Asymmetric radical cyclizations: the synthesis of 6-Alkyl Pyrrolizidin-2-ones
作者:Paul F. Keusenkothen、Michael B. Smith
DOI:10.1016/s0040-4020(01)92242-2
日期:1992.4
This work describes the use of ethyl (5S)-carboethoxy-2-pyrrolidinone (ethyl pyroglutamate) as a chiral starting material for use in radical cyclization reactions. Pyroglutamate is converted to a 5-iodomethyl-N-allylic-2-pyrrolidinone that undergoes radical cyclization under mild conditions. The products are 6-substituted pyrrolizidinone derivatives, produced with high diastereoselectivity.