2-Trimethylsilylethanesulfonyl (SES) versus Tosyl (Ts) Protecting Group in the Preparation of Nitrogen-Containing Five-Membered Rings. A Novel Route for the Synthesis of Substituted Pyrrolines and Pyrrolidines
作者:Valérie Declerck、Hassan Allouchi、Jean Martinez、Frédéric Lamaty
DOI:10.1021/jo062239p
日期:2007.2.1
aza-Baylis−Hillman/alkylation/RCM route. While deprotection of Ts-protected pyrrolines gave only pyrroles, deprotection of the same SES-protected compounds gave either pyrroles or free amine pyrrolines depending on the deprotection conditions. The SES-protected pyrrolines were hydrogenated to yield pyrrolidines with an excellent diastereoselectivity. Free amine pyrrolidines were obtained by HF-mediated
在通过氮杂-Baylis-Hillman /烷基化/ RCM路线获得的含氮五元环的制备中,将2-三甲基甲硅烷基乙磺酰基(或SES)保护基与甲苯磺酰基(Ts)进行了比较。Ts保护的吡咯啉的脱保护仅产生吡咯,而相同的SES保护的化合物的脱保护则根据脱保护条件而产生吡咯或游离胺吡咯。将SES保护的吡咯啉加氢生成具有出色的非对映选择性的吡咯烷。通过HF介导的SES基团的脱保护得到游离的胺吡咯烷。