Intramolecular Hydroboration of Unsaturated Phosphine Boranes
作者:Peter Shapland、Edwin Vedejs
DOI:10.1021/jo040125c
日期:2004.6.1
Homoallylic phosphine boranes undergo intramolecular hydroboration upon activation by triflic acid. The reaction occurs via an intermediate B-trifluorosulfonyloxyborane complex such as 15, followed by SN1-like or SN2-like displacement of the triflate leaving group, apparently leading to the formation of a four-center transition state. In the case of trisubstituted double bonds, as in the substrates
均烯丙基膦硼烷经三氟甲磺酸活化后会发生分子内氢硼化反应。该反应通过中间体B-三氟磺酰氧基硼烷络合物如15发生,随后三氟甲磺酸酯离去基团的S N 1样或S N 2样置换,显然导致形成四中心过渡态。在三取代双键的情况下,如在基材29和32中一样,烯烃的离子氢化与内部氢硼化竞争。
AYREY, PETER M.;WARREN, STUART, TETRAHEDRON LETT., 30,(1989) N4, C. 4581-4584
作者:AYREY, PETER M.、WARREN, STUART
DOI:——
日期:——
Extension of the horner-wittig reaction to the synthesis of -alkenes with chiral substituents: Stereochemical control by acyl transfer
作者:Peter M. Ayrey、Stuart Warren
DOI:10.1016/s0040-4039(01)80750-4
日期:1989.1
crystalline diastereoisomers of hydroxyalkyl phosphine oxides (and hence functionalised -alkenes) can be isolated, even when other chiral centres are present in the molecule, if they are made by acyltransfer.