申请人:——
公开号:US20040049054A1
公开(公告)日:2004-03-11
The invention provides processes for the preparation of fused pyrroles, preferably indoles, which permit the use of inexpensive aromatic amines themselves as the raw material and attain high atomic efficiency and high regioselectivity. Specifically, a process for the preparation of fused pyrroles, e.g., indoles bearing methyl at the 3-position of pyrrole ring and R
1
(or R
2
) of the general formula (4) at the 2-position thereof, or 3,3-disubstituted indoles bearing R
1
and R
2
at the 3-position of pyrrole ring and methyl at the 2-position thereof, characterized by reacting an alkynol of the general formula (4) with an aromatic primary amine in the presence of a ruthenium complex, more preferably with an acid or an ammonium salt thereof being made to coexist.
1
[In the general formula (4), R
1
and R
2
are each independently hydrogen, optionally substituted alkyl, or optionally substituted aryl, or alternatively R
1
and R
2
may be united to form an alkylene chain.]
本发明提供了制备融合吡咯,特别是吲哚的方法,该方法允许使用廉价的芳香胺作为原料,并实现高原子效率和高区域选择性。具体而言,本发明涉及一种制备融合吡咯的方法,例如,在吡咯环的3位上带有甲基和在其2位上具有通式(4)中的R1(或R2),或在吡咯环的3位上带有R1和R2的3,3-二取代吲哚,其在2位上带有甲基,其特征在于在存在钌配合物的情况下,更好地与酸或铵盐共存,将通式(4)的炔醇与芳香基主要胺反应。[在通式(4)中,R1和R2各自独立地表示氢、可选的取代烷基或可选的取代芳基,或者R1和R2可以联合形成一个烷基链。]