Access to Triazolopiperidine Derivatives via Copper(I)‐Catalyzed [3+2] Cycloaddition/Alkenyl C−N Coupling Tandem Reactions
作者:Guorong Xiao、Kaifu Wu、Wei Zhou、Qian Cai
DOI:10.1002/adsc.202100955
日期:2021.11.9
A copper-catalyzed [3+2] cylcoaddition/ alkenyl C−N coupling tandem reaction was demonstrated. It provided a method for the formation of triazolopiperidine skeletons.
Enantiospecific Total Synthesis of the Important Biogenetic Intermediates along the Ajmaline Pathway, (+)-Polyneuridine and (+)-Polyneuridine Aldehyde, as well as 16-Epivellosimine and Macusine A
作者:Wenyuan Yin、M. Shahjahan Kabir、Zhijian Wang、Sundari K. Rallapalli、Jun Ma、James M. Cook
DOI:10.1021/jo100279w
日期:2010.5.21
easier to work up. An enantiospecific total synthesis of (+)-polyneuridine aldehyde (6), which has been proposed as an important biogenetic intermediate in the biosynthesis of quebrachidine (2), was then accomplished in an overall yield of 14.1% in 13 reaction vessels from d-(+)-tryptophan methyl ester (14). Aldehyde 13 was protected as the Na-Boc aldehyde 32 and then converted into the prochiral C(16)-quaternary
Syntheses of Strychnine, Norfluorocurarine, Dehydrodesacetylretuline, and Valparicine Enabled by Intramolecular Cycloadditions of Zincke Aldehydes
作者:David B. C. Martin、Lucas Q. Nguyen、Christopher D. Vanderwal
DOI:10.1021/jo2020246
日期:2012.1.6
base-mediated intramolecular Diels–Alder cycloadditions of tryptamine-derived Zincke aldehydes is described. This important complexity-generating transformation provides the tetracyclic core of many indole monoterpene alkaloids in only three steps from commercially available starting materials and played a key role in short syntheses of norfluorocurarine (five steps), dehydrodesacetylretuline (six steps), valparicine
One-Carbon Homologation of Primary Alcohols to Carboxylic Acids, Esters, and Amides via Mitsunobu Reactions with MAC Reagents
作者:Natsuko Kagawa、Antoinette E. Nibbs、Viresh H. Rawal
DOI:10.1021/acs.orglett.6b00790
日期:2016.5.20
A method is reported for the one-carbon homologation of an alcohol to the extended carboxylic acid, ester, or amide. The process involves the Mitsunobureaction with an alkoxymalononitrile, followed by unmasking in the presence of a suitable nucleophile. The homologation and unmasking can even be performed in a one-pot process in high yield.
Cyclization of 2-Alkynylallyl Alcohols to Highly Substituted Furans by Gold(I)-Carbene Complexes
作者:A. Stephen K. Hashmi、Tobias Häffner、Matthias Rudolph、Frank Rominger
DOI:10.1002/ejoc.201001479
日期:2011.2
Various 2-alkynylallylalcohols were synthesized by a generally applicable Sonogashira coupling protocol. Subsequent gold-catalyzed transformation was investigated. The use of AuI catalysts bearing carbene ligands, of either the N-heterocyclic carbene or nitrogen acyclic carbene type, delivered the desired products with low catalyst loadings and under very mild reaction conditions. A broad array of