Formal Desymmetrization by a “Mitsunobu Trick” − Enantiomerically Purecis-3,4-DihydroxypyrrolineN-Oxides for the Enantiodivergent Synthesis of Trihydroxyindolizidines
作者:Stefano Cicchi、José Nunes、Andrea Goti、Alberto Brandi
DOI:10.1002/(sici)1099-0690(199803)1998:3<419::aid-ejoc419>3.0.co;2-v
日期:1998.3
enantioselective formal desymmetrization of Cs-symmetric diols by monoprotection of the corresponding enantiopure C2 diols, followed by an inversion of configuration by a Mitsunobu reaction (“Mitsunobu trick”). Its application to the unprecedented synthesis of enantiopure cis-3,4-dihydroxypyrroline N-oxides, employed in the enantiodivergent synthesis of two selectively protected 1,2,7-trihydroxyindolizidines
通过对相应的对映纯 C2 二醇进行单保护,然后通过 Mitsunobu 反应(“Mitsunobu 技巧”)进行构型反转,提出了 Cs 对称二醇的完全对映选择性形式去对称化的协议。还报道了其在前所未有的对映纯 cis-3,4-dihydroxypyrroline N-oxides 合成中的应用,用于两种选择性保护的 1,2,7-trihydroxyindolizidines 的对映发散合成。