Pd-catalyzed sp–sp<sup>3</sup> cross-coupling of benzyl bromides using lithium acetylides
作者:Anirban Mondal、Paco Visser、Anna M. Doze、Jeffrey Buter、Ben L. Feringa
DOI:10.1039/d1cc02762j
日期:——
Organolithium-based cross-couplingreactions have emerged as an indispensable method to construct C–C bonds. These transformations have proven particularly useful for the direct and fast coupling of various organolithium reagents (sp, sp2, and sp3) with aromatic (pseudo) halides (sp2). Here we present an efficient method for the cross-coupling of benzyl bromides (sp3) with lithium acetylides (sp). The reaction proceeds
Palladium-catalyzed direct coupling reaction of propargylic alcohols with arylboronic acids
作者:Masahiro Yoshida、Takahiro Gotou、Masataka Ihara
DOI:10.1016/j.tetlet.2004.05.147
日期:2004.7
The direct coupling of propargylic alcohols with arylboronicacids has been achieved using palladium catalyst. Various propargylic alcohols and arylboronicacids can be coupled to afford the corresponding allenic and propargylic arenes, which are selectively produced depending on the substituent on the propargylic alcohol, respectively.
Enantioselective Synthesis of Allylic Sulfones via Rhodium-Catalyzed Direct Hydrosulfonylation of Allenes and Alkynes
作者:Chieh-Yu Chang、Aaron Aponick
DOI:10.1021/jacs.4c05629
日期:2024.6.26
A highlyregio- and enantioselective hydrosulfonylation using commercially available sodium sulfinates is reported, providing the first direct asymmetric rhodium-catalyzed hydrosulfonylation of allenes/alkynes to synthesize chiral allylic sulfones. Ligand screening studies demonstrated the indispensable role of the C1-symmetric P,N-ligand (Rax,S,S)-StackPhim for achieving both high regioselecitivity
据报道,使用市售亚磺酸钠进行高度区域和对映选择性氢磺酰化,提供了第一个直接不对称铑催化的丙二烯/炔烃氢磺酰化,以合成手性烯丙砜。配体筛选研究证明了C 1 -对称 P,N-配体 ( R ax , S , S )-StackPhim 对于实现高区域选择性 (>20:1) 和对映选择性 (高达 97% ee) 的不可或缺的作用。值得注意的是,操作简单的方法和温和的条件允许快速制备具有广泛官能团的手性烯丙基砜。此外,使用叔丁基二甲基甲硅烷氧基甲亚磺酸钠可以在受保护的羟甲基产物的简单转化后集体合成各种手性砜衍生物。
WU, GUANGZHONG;CEDERBAUM, FREDRICK E.;NEGISHI, EI-ICHI, TETRAHEDRON LETT., 31,(1990) N, C. 493-496