Gold-Catalyzed Asymmetric Thioallylation of Propiolates via Charge-Induced Thio-Claisen Rearrangement
作者:Hanbyul Kim、Jiwon Jang、Seunghoon Shin
DOI:10.1021/jacs.0c09783
日期:2020.12.9
A gold(I)-catalyzedenantioselective thioallylation of propiolates with allyl sulfides is described. The key mechanistic element is a sulfonium-induced Claisenrearrangement which helps minimize the allyl dissociation and render higher enantioselectivity. This protocol features remarkable scope of the allyl moiety, allowing enantiocontrolled synthesis of all-carbon quaternary centers, and exhibits
Stereoselective synthesis of the C14 C23 fragment of biselyngbyolide A and B enabled by transition metal catalysis
作者:Rakesh G. Thorat、Bailey A. Brooks、Brandon Nichols、Andrew M. Harned
DOI:10.1016/j.tet.2018.10.066
日期:2018.12
Transition met al catalysis has enabled the highly stereoselective and protecting group-free synthesis of the C14-C23 fragment of the apoptosis-inducing natural products biselyngbyolide A and B. A Pd-catalyzed Stille reaction between a vinyl stannane and a crotyl carbonate formed the skipped diene with complete control of the the trisubstituted bond and excellent control over the branched/linear products
过渡金属催化能够高度立体选择性且无保护基地合成诱导细胞凋亡的天然产物 biselngbyolide A 和 B 的 C14-C23 片段。乙烯基锡烷和巴豆基碳酸酯之间的 Pd 催化 Stille 反应形成了跳跃的二烯对三取代键的完全控制和对支化/直链产物的出色控制。使用铜催化的斯塔尔氧化来形成银催化的不对称烯丙基化所需的醛。后者为最终片段提供了出色的立体化学控制。
Palladium-catalyzed cyclizations of bromodialkenyl ethers and amines
作者:L. Shi、C. K. Narula、K. T. Mak、L. Kao、Y. Xu、R. F. Heck
DOI:10.1021/jo00170a005
日期:1983.11
Constructing the architecturally distinctive ABD-tricycle of phomactin A through an intramolecular oxa-[3+3] annulation strategy
作者:Grant S. Buchanan、Kevin P. Cole、Gang Li、Yu Tang、Ling-Feng You、Richard P. Hsung
DOI:10.1016/j.tet.2011.09.111
日期:2011.12
Our efforts in constructing the ABD-ring of phomactin A through an intramolecular oxa-[3+3] annulation strategy is described. This struggle entailed finding a practical and efficient preparation of annulation precursor, and a realization of the unexpected competing regioisomeric pathway. The success entailed accessing the A-ring through Diels Alder cycloaddition of Rawal's diene. Furthermore, the discovery that the regioisomers from the annulation existed as atropisomers with respect to the D-ring olefin and that they could be equilibrated to the desired ABD-tricycle, allowing large quantities of tricycle to be accessed. Published by Elsevier Ltd.
SHI, L.;NARULA, C. K.;MAK, K. T.;KAO, L.;XU, Y.;HECK, R. F., J. ORG. CHEM., 1983, 48, N 22, 3894-3900
作者:SHI, L.、NARULA, C. K.、MAK, K. T.、KAO, L.、XU, Y.、HECK, R. F.