N-Methylsulfonimidoyl-Substituted (2-Alkenyl)titanium Complexes: Application to the Synthesis of β- and δ-Sulfonimidoyl-Substituted Chiral Homoallylic Alcohols, X-ray Crystal Structure Analysis, and Fluxional Behavior
作者:Hans-Joachim Gais、Rüdiger Hainz、Harald Müller、Peter Richard Bruns、Nicole Giesen、Gerhard Raabe、Jan Runsink、Sabine Nienstedt、Jürgen Decker、Marcel Schleusner、Jochen Hachtel、Ralf Loo、Chang-Wan Woo、Parthasarathi Das
DOI:10.1002/1099-0690(200012)2000:24<3973::aid-ejoc3973>3.0.co;2-b
日期:2000.12
corresponding (Z)-configured allylic sulfoximines, which were subsequently isomerized by DBU to preferentially yield the (E)-isomers. Titanation of lithiated (E)-configured allylic sulfoximines with ClTi(OiPr)3 furnished the corresponding bis(2-alkenyl)diisopropyloxytitanium(IV) complexes, which reacted with aldehydes in the presence of ClTi(OiPr)3 with high regio- and diastereoselectivities at the γ-position
已从 N,S-二甲基-S-苯基亚砜亚胺和醛通过加成-消除-异构化路线通过相应的 (E)-构型乙烯基亚砜的中间生成合成了对映体纯无环 (E)-和 (Z)-构型的烯丙基亚砜亚胺亚砜亚胺。乙烯基亚砜亚胺与 DBU 的异构化优先提供相应的 (Z)-构型的烯丙基亚砜亚胺,随后由 DBU 异构化以优先产生 (E)-异构体。用 ClTi(OiPr)3 对锂化 (E)-构型的烯丙基亚砜亚胺进行钛化,得到相应的双(2-烯基)二异丙氧基钛(IV)配合物,其在 ClTi(OiPr)3 存在下与醛反应,在 γ 位具有高区域选择性和非对映选择性,以良好的产率得到相应的 (Z)-反构型 δ-N-甲基磺酰亚胺酰基取代的高烯丙醇。在低温下不存在 ClTi(OiPr)3 的情况下,只有双(烯基)二异丙氧基钛络合物的一个烯丙基部分转移到醛上。通过这种方式,环状锂化烯丙基亚砜亚胺以高区域选择性和非对映选择性转化为相应的带有乙烯基磺酰亚胺酰基的高烯丙醇。用