A gold catalyzed formal intermolecular [2+3] cyclo-coupling of 1,3-enynes with phenols was developed to prepare dihydrobenzofuran derivatives with the addition of 2,6-dichloropyridine N-oxide, in which, a highly ortho-selective phenol SEAr functionalization was achieved by using 1,3-enynes as α-oxo vinyl gold carbenoid surrogates.
开发了金催化的 1,3-烯炔与苯酚的正式分子间 [2+3] 环偶联,通过添加 2,6-二氯吡啶N-氧化物制备二氢苯并呋喃衍生物,其中,高度邻位选择性的苯酚 S E Ar 官能化是通过使用 1,3-烯炔作为 α-氧代乙烯基金卡宾酸替代物来实现的。
Stereodivergent Synthesis of Tertiary Fluoride-Tethered Allenes via Copper and Palladium Dual Catalysis
作者:Shao-Qian Yang、Yi-Fan Wang、Wei-Cheng Zhao、Guo-Qiang Lin、Zhi-Tao He
DOI:10.1021/jacs.1c03157
日期:2021.5.19
protocol for the unprecedented stereodivergentsynthesis of tertiary fluoride-tethered allenes bearing a stereogenic center and stereogenic axis via Cu/Pdsynergisticcatalysis. A broad scope of conjugated enynes are coupled with various α-fluoroesters in high yields with high diastereoselectivities and generally >99% ee. In addition, the four stereoisomers of the allene products ensure precise access
Copper- and Cobalt-Catalyzed Direct Coupling of sp<sup>3</sup> α-Carbon of Alcohols with Alkenes and Hydroperoxides
作者:Jun-Kee Cheng、Teck-Peng Loh
DOI:10.1021/ja510635k
日期:2015.1.14
A zerovalent copper- and cobalt-catalyzed direct coupling of the sp(3) α-carbon of alcohols with alkenes and hydroperoxides was developed in which the hydroperoxides acted as radical initiator and then coupling partner. 1,3-Enynes and vinylarenes underwent alkylation-peroxidation to give β-peroxy alcohols and β-hydroxyketones correspondingly with excellent functional group tolerance. The resulting
Cu/Pd-catalyzed enantioselectivesynthesis of multisubstituted allenes is established. By employing chiral sulfoxide phosphine (SOP)/Cu and PdCl2 (dppf) complexes as catalysts, the 1,4-arylboration of 1,3-enynes provides an efficient approach to trisubstituted chiralallenes with up to 92 % yield and 97:3 er. Furthermore, by using 2-substituted 1,3-enynes as substrates, the tetrasubstitutedchiralallenes were
建立了铜/钯催化的多取代烯的对映选择性合成。通过使用手性亚砜膦(SOP)/ Cu和PdCl2(dppf)配合物作为催化剂,1,3-烯炔的1,4-芳基硼化提供了一种高效的三取代手性异戊烯的方法,收率高达92%和97:3 er 。此外,通过使用2-取代的1,3-烯炔作为底物,使用该策略成功地产生了四取代的手性烯丙基。最后,理论计算表明,烯丙基铜物种的金属转移是该转变的限速步骤。
Halogenated salt assisted Cu-catalyzed asymmetric 1,4-borylstannation of 1,3-enynes: enantioselective synthesis of allenylstannes
halogenated salt, plays a crucial role in the success. Control experiments and theoretical studies disclosed that the four-membered ring transmetallation transitionstates which were stabilized by a halide anion are the key to yields and stereochemical outcomes.