Copper(II) tetrafluoroborate as an extremely efficient catalyst for 1,3-dithiolane/dithiane formation from carbonyl compounds under solvent-free conditions at room temperature
作者:Ram C. Besra、Santosh Rudrawar、Asit K. Chakraborti
DOI:10.1016/j.tetlet.2005.07.059
日期:2005.9
formation from aromatic, heteroaromatic and aliphatic aldehydes and cyclic saturated ketones in 1–5 min under solvent-free conditions at room temperature. The reaction is compatible with other functionalities such as ether, ester, hydroxyl, halide, nitro and cyano groups and exhibits excellent chemoselectivity. α,β-Unsaturated aldehydes/ketones lead to selective formation of 1,3-dithiolanes instead of
四氟硼酸铜(II)水合物是一种新型且极其有效的催化剂,在室温下无溶剂条件下,可在1-5分钟内由芳族,杂芳族和脂肪族醛类和环状饱和酮形成1,3-二硫杂环戊烷/二硫杂环丁烷。该反应与其他官能团如醚,酯,羟基,卤化物,硝基和氰基相容,并显示出优异的化学选择性。α,β-不饱和醛/酮可导致选择性形成1,3-二硫杂环戊烷而不是迈克尔加成产物。对于带有醛和酮羰基的底物,与醛发生化学选择性的二硫杂环戊烷。