Bis-heteroannulation. 15. Enantiospecific syntheses of (+)- and (-)-norsecurinine
作者:Peter A. Jacobi、Charles A. Blum、Robert W. DeSimone、Uko E. S. Udodong
DOI:10.1021/ja00014a033
日期:1991.7
(−)-Norsecurinine (2a) has been prepared in a stereospecific fashion with the acetylenic oxazole 39 as the starting material. Diels-Alder cyclization of 39 afforded the furano ketone 45 that was transformed in five steps to the butenolide mesylate 52. Transannular alkylation of 52 then afforded 2a. In identical fashion, ent-39 gave(+)-norsecurinine (2b)
An enantioselective approach to the Securinega alkaloids: the total synthesis of (+)-norsecurinine and (+)-allonorsecurinine
作者:Matthew R. Medeiros、John L. Wood
DOI:10.1016/j.tet.2010.03.015
日期:2010.6
Total syntheses of (+)-norsecurinine and (+)-allonorsecurinine are described that utilize a rhodium carbenoid-initiated O–H insertion/Claisen rearrangement/1,2-allyl migration domino process for the stereoselective introduction of the tertiary alcohol moiety. Overall the employed strategy is flexible and will allow access to other members of the Securinega family of alkaloids.