An unambiguous and precise method for the synthesis of 3,1-benzoxathiin-4-ones/1,3-benzodioxin-4-ones by the reaction of propargylic alcohols and salicylic/thiosalicylic acids under a catalyst-free and open-air atmosphere is described.
Tandem Reaction of Propargylic Alcohol, Sulfonamide, and <i>N</i>-Iodosuccinimide: Synthesis of <i>N</i>-(2-Iodoinden-1-yl)arenesulfonamide
作者:Yuanxun Zhu、Guangwei Yin、Deng Hong、Ping Lu、Yanguang Wang
DOI:10.1021/ol103074d
日期:2011.3.4
An efficient and straightforward strategy for the synthesis of N-(2-haloinden-1-yl)arenesulfonamides from propargylic alcohols and sulfonamides is described. Allenesulfonamide is postulated to be the key intermediate for this tandem transformation.
A new method for the efficient synthesis of hexahydro-1H-fluorene and octahydrobenzo[a]azulene derivatives through a ring-expansion strategy is reported. With an appropriate combination of thulium(III) trifluoromethanesulfonate and 13X molecular sieves, a range of unsaturated polycycliccompounds were obtained in good yields. Mechanism studies reveal that the reaction is more likely to undergo Meyer–Schuster
Synthesis of Functionalized Indenes via Cascade Reaction of Aziridines and Propargyl Alcohols
作者:Shaoyin Wang、Yuanxun Zhu、Yanguang Wang、Ping Lu
DOI:10.1021/ol901033h
日期:2009.6.18
A concise synthesis of functionalized indenes via the Lewis acid catalyzed cascadereaction of aziridines and propargylic alcohols has been developed. The methodology offers great potential for the synthesis of biologically active indene derivatives and related polycyclic compounds.
Cooperative Palladium/Brønsted Acid Catalysis toward the Highly Enantioselective Allenylation of β-Keto Esters
作者:Henning J. Loui、Christoph Schneider
DOI:10.1021/acs.orglett.2c00179
日期:2022.2.25
We report the first enantioselective allenylation of Pd enolates enabled by cooperative Pd/Brønsted acid catalysis employing β-keto esters and propargyl alcohols. The enantioselectivity originates solely from an in-situ-generated chiral metal enolate in an open transition state with no additional binding of the propargyl component to the catalyst. Thus a broad substrate scope was established, furnishing