Rh(I)-Catalyzed Reaction of 2-(Chloromethyl)phenylboronic Acids and Alkynes Leading to Indenes
摘要:
The reaction of 2-(chloromethyl)phenylboronic acid (1) with alkynes in the presence of a Rh(I) complex gave indene derivatives in high yields. The regioselectivity depends on the steric nature of the substituent on the alkynes. A bulky group favors the alpha-position of indenes.
ortho-Halomethylphenyllead triacetates (halo = bromine or chlorine) react with phenols in the presence of triethylamine and a pyridine derivative to afford modest to good yields of dibenzo[b,d]-6H-pyrans. (C) 2001 Elsevier Science Ltd. All rights reserved.
Reductive coupling of polyfunctionalized organobismuth and organolead arylating reagents in the synthesis of benzopyran derivatives
作者:A. Yu. Fedorov、J. -P. Finet、O. G. Ganina、M. I. Naumov、A. S. Shavyrin
DOI:10.1007/s11172-006-0163-9
日期:2005.11
Benzopyran derivatives were synthesized in good yields by the reactions of tris[2-(chloromethyl)phenyl]bismuth diacetate and 2-(halomethyl)aryllead triacetates with phenols and naturally occurring 4-hydroxycoumarins in the presence of bases according to a three-step one-pot procedure.
The reaction of 2-(chloromethyl)phenylboronic acid (1) with alkynes in the presence of a Rh(I) complex gave indene derivatives in high yields. The regioselectivity depends on the steric nature of the substituent on the alkynes. A bulky group favors the alpha-position of indenes.