S-烷基,S-芳基和S-乙烯基硫代硫酸钠盐(Bunte盐)与Grignard试剂反应生成硫化物,收率很高。S-烷基邦特盐是由无味的硫代硫酸钠通过与烷基卤化物的S N 2反应制备的。开发了铜催化的硫代硫酸钠与芳基卤化物和乙烯基卤化物的偶联物,以得到S-芳基和S-乙烯基丁烯酸盐。该反应适合于多种结构的邦特盐和格氏试剂。重要的是,这种硫化物的途径避免了使用恶臭的硫醇原料或副产物。
A CuI promoted sulfenylation of organozinc reagents with arylsulfonyl chlorides/PPh3 has been explored. This reaction proceeded smoothly through an alkyl/aryl radical (generated from organometallics) under mild conditions and produced the desired sulfide products in excellent yields.
transition metal‐free approach to achieve the selective cleavage of the α‐carbonyl C(sp3)−H bond in alkylesters by using inexpensive, low‐toxic, and insensitive perfluoroalkyl iodide as the radical initiator has been developed. A variety of enamides, N‐heterocycles, amides, thiophenols, and phenols could be successfully incorporated into functionalizedalkyl groups by intermolecular amination, thioetherification
Electrochemical S–H and O–H insertion reactions from thiols or salicylic acids with diazo esters
作者:Zhiqin He、Wei Zhao、Yufeng Li、Yang Yu、Fei Huang
DOI:10.1039/d2ob01273a
日期:——
An electrochemical carbenoid insertion reaction of diazo compounds into C–S and C–O bonds with electricity as the oxidant has been reported in this work. In this protocol, this transformation proceeded smoothly under mild conditions at room temperature in the absence of a catalyst and a ligand. In addition, the yield of the S–H insertion product was up to 96% and the O–H product could be efficiently
D The present invention relates to ion pair catalysts (I) comprising the cationic bisguanidinium ligand (A) and diperoxomolybdate anion (B). The present invention also relates to ion pair catalysts (III) comprising the cationic bisguanidinium ligand (C) and peroxotungstate anion (D). It further relates to the use of the said catalysts in the manufacture of enantiomerically enriched sulfoxides.
D 本发明涉及由阳离子双胍配体(A)和二氧钼酸阴离子(B)组成的离子对催化剂(I)。本发明还涉及由阳离子双胍配体(C)和过氧钨酸盐阴离子(D)组成的离子对催化剂(III)。本发明还涉及上述催化剂在制造对映体富集的硫氧化物中的用途。
Preparation of Asymmetric Phase-transfer Catalyst, 1,4-Bis((4S,5S)-1,3-bis(3,5-di-tert-butylbenzyl)-4,5-diphenylimidazolidin-2-ylidene)piperazine-1,4-diium chloride