Palladium/H<sup>+</sup>-cocatalyzed kinetic resolution of tertiary propargylic alcohols
作者:Wanli Zhang、Shengming Ma
DOI:10.1039/c8cc01949e
日期:——
A new approach to not-readily-available opticallyactive tertiary propargylic alcohols through palladium/H+-cocatalyzed carboxylation of racemic tertiary propargylic alcohols with CO and MeOH has been described. Bothenantiomers can be obtained with no less than 90% ee utilizing (R) or (S)-DTBM-Segphos. Various transformations of the opticallyactive alcohols have been demonstrated.
已经描述了通过钯/ H + -外消旋的叔炔丙醇与CO和MeOH的羧化羧化反应来制备尚未得到的旋光性叔炔丙醇的新方法。利用(R)或(S)-DTBM-Segphos,两种对映体都可以以不小于90%的ee获得。已经证明了旋光性醇的各种转化。
Rhodium(III)-Catalyzed C–H Functionalization in Water for Isoindolin-1-one Synthesis
作者:Shangze Wu、Xiaoyan Wu、Chunling Fu、Shengming Ma
DOI:10.1021/acs.orglett.8b00780
日期:2018.5.18
Rhodium-catalyzed green synthesis of isoindolin-1-ones via a sequential C–H activation/allene formation/cyclization pathway by applying water as solvent is reported. The reaction is highly regioselective, tolerating some potentially useful functional groups.
Hydroxy group-enabled highly regio- and stereo-selective hydrocarboxylation of alkynes
作者:Chaofan Huang、Hui Qian、Wanli Zhang、Shengming Ma
DOI:10.1039/c8sc05743e
日期:——
Here we present an example of utilizing hydroxy groups for regioselectivity control in the addition reaction of alkynes—a highly efficient Pd-catalyzed syn-hydrocarboxylation of readily available 2-alkynylic alcohols with CO in the presence of alcohols with an unprecedented regioselectivity affording 3-hydroxy-2(E)-alkenoates. The role of the hydroxy group has been carefully studied. The synthetic
在这里,我们展示了一个在炔烃的加成反应中利用羟基进行区域选择性控制的例子——在醇的存在下,一种高效的 Pd 催化的 2-炔醇与 CO 的顺式加氢羧化反应,具有前所未有的区域选择性,提供 3-羟基-2( E )-链烯酸酯。羟基的作用已被仔细研究过。产品的合成潜力也得到了证明。
Thompson; Margnetti, Journal of the American Chemical Society, 1942, vol. 64, p. 575