are described for the synthesis of the corresponding tetrahydropyridines and pyran derivatives, respectively. In particular, the use of pyridine-carboxaldehydes for aza-silyl-Prins reaction led to either a symmetrical triarylmethane or two new bicyclic compounds. 4-Fluorinated-2-substituted tetrahydropyranderivatives were also obtained in the oxa-Prins cyclization with good selectivity in favor of
On the choice of Lewis acids for the Prins reaction; two total syntheses of (±)-Civet
作者:Freda K. Chio、Julie Warne、Damien Gough、Mark Penny、Sasa Green (née Martinović)、Simon J. Coles、Mike B. Hursthouse、Peter Jones、Lorraine Hassall、Thomas M. McGuire、Adrian P. Dobbs
DOI:10.1016/j.tet.2011.05.019
日期:2011.7
While developing new variations of the Prins cyclisation reaction, the effect of the choice of Lewis acid on the outcome of the reaction and the product(s) has been investigated, yielding hitherto unseen dihydropyran products in the Prins cyclisation reaction of homoallylic alcohols, and two new modifications of the reaction: the triflate-trapped Prins adduct and the Mukaiyama-Aldol-silyl-Prins reaction. Two of these methods are employed in two complementary total syntheses of the important perfumery compound, (+/-)-Civet. (C) 2011 Elsevier Ltd. All rights reserved.
Practical and Highly Selective CH Functionalization of Structurally Diverse Ethers
作者:Miao Wan、Zhilin Meng、Hongxiang Lou、Lei Liu
DOI:10.1002/anie.201407083
日期:2014.12.8
A trityl ion mediated CHfunctionalization of ethers with a wide range of nucleophiles at ambient temperature has been developed. The reaction displays high chemoselectivity and good functional group tolerance. The protocol also exhibits excellent regio‐ and diastereoselectivities for the unsymmetric ethers, thus stereoselectively generating highlyfunctionalized disubstituted 2,5‐trans tetrahydrofurans