The Propargyl Rearrangement to Functionalised Allyl-Boron and Borocation Compounds
作者:Lewis C. Wilkins、James R. Lawson、Philipp Wieneke、Frank Rominger、A. Stephen K. Hashmi、Max M. Hansmann、Rebecca L. Melen
DOI:10.1002/chem.201602719
日期:2016.10.4
range of Lewisacidic alkyl, vinyl and aryl boranes and borenium compounds that are capable of new carbon–carbon bond formation through selective migratory group transfer have been synthesised. Utilising a series of heteroleptic boranes [PhB(C6F5)2 (1), PhCH2CH2B(C6F5)2 (2), and E‐B(C6F5)2(C6F5)C=C(I)R (R=Ph 3 a, nBu 3 b)] and borenium cations [phenylquinolatoborenium cation ([QOBPh][AlCl4], 4)], it has
合成了多种路易斯酸性烷基,乙烯基和芳基硼烷和硼化合物,它们能够通过选择性迁移基团转移形成新的碳-碳键。利用一系列杂芳族硼烷[PhB(C 6 F 5)2(1),PhCH 2 CH 2 B(C 6 F 5)2(2)和E ‐B(C 6 F 5)2(C 6 F 5)C = C(I)R(R = Ph 3 a,n Bu 3 b)]和硼阳离子[苯基喹啉-硼阳离子([QOBPh] [AlCl 4 ],4)],已证明这些硼基化合物能够通过与各种炔丙基酯进行复杂的重排反应来生产新的烯丙基硼和硼化合物和氨基甲酸酯。这些反应在一锅反应中产生了高度官能化的,合成上有用的硼取代的有机化合物,且具有相当大的分子复杂性。
Activation of Alkynes with B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub> – Boron Allylation Reagents Derived from Propargyl Esters
作者:Max M. Hansmann、Rebecca L. Melen、Frank Rominger、A. Stephen K. Hashmi、Douglas W. Stephan
DOI:10.1021/ja4110842
日期:2014.1.15
Novel allyl boron compounds are readily synthesized via rearrangementreactions between Lewis acidic B(C6F5)3 and propargyl esters. These reactions proceed through an initial cyclization followed by ring-opening and concurrent C6F5-group migration. In the absence of disubstitution adjacent to the ester oxygen atom, an allyl boron migration rearrangement leads to formal 1,3-carboboration products. These