A New Route to α-Carbolines Based on 6π-Electrocyclization of Indole-3-alkenyl Oximes
作者:Sophie J. Markey、William Lewis、Christopher J. Moody
DOI:10.1021/ol403191k
日期:2013.12.20
Indoles are converted into alpha-carbolines in four steps by acylation at C-3, Boc-protection, olefination of the resulting 3-indolylaldehydes or ketones to give N-Boc-3-indolyl alkenyl oxime O-methyl ethers, which upon heating to 240 degrees C under microwave irradiation undergo loss of the Boc-group, and 6 pi-electrocyclization to alpha-carbolines, following aromatization by loss of methanol (11 examples, 30-90% yield).