Process for the preparation of 5-(substituted)-10 methoxy-2,2,4-trimethyl-2,5-dihydro-
1H-chromeno [3,4-f] quinolines and derivatives thereof
申请人:——
公开号:US20030069427A1
公开(公告)日:2003-04-10
The present invention relates to an efficient process for the preparation of 5-(substituted)-10-methoxy-2,2,4-trimethyl-2,5-dihydro-1H-chromeno[3,4-f]quinolines.
ipso-cyclization to furnish spiro[4.5]decadienones, which rearranged to benzoxepanes upon thermal activation. The stereochemical information was relayed through this high-yielding sequence. Mechanistically, the rearrangement was proposed to proceed via the uncommon ring closure of enoate/quinone oxonium zwitterionic intermediate. Computational studies were conducted to help explain the product distribution