Reversal of enantioselectivity on protonation of enol(ate)s derived from 2-methyl-1-tetralone using C2-symmetric sulfonamides
摘要:
The synthesis of enantiomerically enriched (R)-2-methyl-1-tetralone 1 (64% e.e.) was achieved through protonation of its lithium enolate 3 using a C-2-symmetrical bis-sulfonamide 5d as an internal proton source. Access to the complementary (S)-enantiomer 1 (45% e.e.) can be achieved using an external quench strategy involving acetic acid as the external proton source. (C) 2004 Elsevier Ltd. All rights reserved.
Introduction of N,N'-disulfonylhydrazines as new sulfonylating reagents for highly efficient synthesis of (E)-β-iodovinyl arenesulfones under mild conditions
作者:Dongping Luo、Lin Min、Weiping Zheng、Lidong Shan、Xinyan Wang、Yuefei Hu
DOI:10.1016/j.cclet.2019.12.040
日期:2020.7
self-dimerization synthesis of disulfones controlled by the “solvent-cage-effects”. In this article, N,N′-disulfonylhydrazines were introduced as new sulfonylating reagents and their combinations with NIS were disclosed as new iodosulfonylating reagents of alkynes. Finally, a highly efficient method for the synthesis of (E)-β-iodovinyl arenesulfones was developed by mixing an alkyne, a N,N′-disulfonyl-hydrazine
N,N′-Disulfonylhydrazines: New sulfonylating reagents for highly efficient synthesis of (E)-vinyl sulfones at room temperature
作者:Dongping Luo、Lin Min、Weiping Zheng、Lidong Shan、Xinyan Wang、Yuefei Hu
DOI:10.1016/j.tet.2020.131019
日期:2020.3
has not been applied in organic synthesis except the formation of disulfones by self-dimerization of sulfonyl radicals. In this article, they were introduced as new sulfonylating reagents and their combinations with NIS and Et3N were established as excellent iodosulfonylating reagents for alkenes. Finally, a highly efficient method for the synthesis of (E)-vinyl sulfones was developed by mixing an alkene
Synthesis of <i>C</i>-Unsubstituted 1,2-Diazetidines and Their Ring-Opening Reactions via Selective N–N Bond Cleavage
作者:Hetti Handi Chaminda Lakmal、Joanna Xiuzhu Xu、Xue Xu、Bassem Ahmed、Christopher Fong、David J. Szalda、Keith Ramig、Andrzej Sygula、Charles Edwin Webster、Dongmao Zhang、Xin Cui
DOI:10.1021/acs.joc.8b01223
日期:2018.8.17
reaction. 1,2-Diazetidine derivatives bearing various N-arylsulfonyl groups were readily accessed and studied by experimental and computed Raman spectra. The ring-opening reaction of the diazetidine was explored and resulted in the identification of a selective N–N bond cleavage with thiols as nucleophiles, which stereoselectively produced a new class of N-sulfenylimine derivatives with C-aminomethyl groups
A novel and efficient method for direct tosyloxylation at the C5 position of 8‐aminoquinolines has been accomplished by nonmetal‐catalyzed C–H functionalization with mild reaction conditions. Although there are some reports of direct tosyloxylation of anilide, this is the first example in which 1,2‐disulfonyl hydrazides and PIDA perform as sulfonate source.