23S)-Homobrassinolide (2α, 3α, 22S, 23S-tetrahydroxy-24S-etyl-B-homo-7-oxa-5α-cholestan-6-one) and brassinolide (2α, 3α 22R, 23R-tetrahydroxy-24S-methyl-B-homo-7-oxa-5α-cholestan-6-one) were synthesized fromstigmasterol and shown to promote plant growth.
Cyclometalated (NNC)Ru(<scp>ii</scp>) complex catalyzed β-methylation of alcohols using methanol
作者:Kasturi Ganguli、Natalia V. Belkova、Sabuj Kundu
DOI:10.1039/d1dt03967a
日期:——
this strategy, a wide range of primary, secondary, and aliphatic straight chain alcohols were selectively methylated. This protocol was further employed for the methylation of a few natural products and the gram scale synthesis of β-methylated alcohols. A series of control experiments and kinetic studies were performed to understand the plausible reaction mechanism.
合成了含有基于菲咯啉的新配体及其相应的Ru( II )配合物的吲哚基片段,并通过各种光谱技术对其进行了充分表征。研究了这些新合成的环金属化 (NNC)Ru( II ) 配合物对使用甲醇对醇进行 β-甲基化的催化活性。值得注意的是,这些配合物与各种 (NNN)Ru( II) 配合物。利用这种策略,多种伯醇、仲醇和脂肪族直链醇被选择性甲基化。该协议进一步用于一些天然产物的甲基化和 β-甲基化醇的克级合成。进行了一系列对照实验和动力学研究,以了解合理的反应机制。