A Stereoselective and Atom-Efficient Approach to Multifunctionalized Five- and Six-Membered Rings via a Novel Michael-Initiated Intramolecular Diels−Alder Furan Reaction
作者:Irishi N. N. Namboothiri、Madhu Ganesh、Shaikh M. Mobin、Miriam Cojocaru
DOI:10.1021/jo048262x
日期:2005.3.1
of key precursors to the intramolecular Diels−Alder reaction of furan diene (IMDAF) have been prepared via a very facile 1,4-addition of O-, S-, N-, and C-centered nucleophiles possessing unsaturated tether to β-furyl nitroethylene. Subsequent IMDAF reaction of the 1,4-adducts, carried out under thermal conditions, provided five- and six-membered carbocycles and heterocycles fused to an easily cleavable
呋喃二烯(IMDAF)分子内Diels-Alder反应的多种关键前体已经通过非常容易地将具有不饱和系链的O-,S-,N-和C-中心的1,4-加成亲核试剂制备成-呋喃基硝基乙烯。在热条件下进行的1,4-加合物的随后IMDAF反应提供了与易裂解的氧杂环庚烯部分融合的五元和六元碳环和杂环。环加合物的结构和立体化学通过2D-NMR实验确定,并通过X射线晶体学进一步证实。该策略的显着特征包括在环加成中的高度立体选择性(> 80:20),原子和步长经济性以及生成多个手性中心和官能度。