Remote Asymmetric Bromination Reaction with Vinylketene Silyl <i>N</i>,<i>O</i>-Acetal and Its Application to Total Synthesis of Pellasoren A
作者:Shinji Sekiya、Mao Okumura、Kei Kubota、Tatsuya Nakamura、Daisuke Sekine、Seijiro Hosokawa
DOI:10.1021/acs.orglett.7b00920
日期:2017.5.5
Stereoselective bromination of the E,E-vinylketene silyl N,O-acetal possessing a chiral auxiliary has been achieved and applied to introduction of heteroatom at γ-position of α,β-unsaturated imide. The reactions proceeded in high stereoselectivity. Total synthesis of pellasoren A, an antitumor propionate from the myxobacteriun Sorangium cellulosum, has been accomplished in short steps by this methodology
已获得具有手性助剂的E,E-乙烯基乙烯酮甲硅烷基N,O-缩醛的立体选择性溴化,并将其用于在α,β-不饱和酰亚胺的γ位引入杂原子。反应以高立体选择性进行。通过这种方法和我们的还原性丙酸酯合成方法,可以在很短的时间内完成全合成纤维胶酶A(一种来自粘胶细菌纤维素的抗肿瘤丙酸酯)。