Synthesis 2015; 47(08): 1117-1122
DOI: 10.1055/s-0034-1380177
paper
© Georg Thieme Verlag Stuttgart · New York

Tandem Prins and Friedel–Crafts Cyclizations for the Stereo­selective Synthesis of trans-Fused Hexahydro-1H-benzo[g]isochromene Derivatives

B. V. Subba Reddy*
a   Natural Product Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India, Email: basireddy@iict.res.in
,
Ch. Syama Sundar
a   Natural Product Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India, Email: basireddy@iict.res.in
b   Department of Chemistry, Sri Venkateswara University, Tirupati 517 502, India
,
M. Ramana Reddy
b   Department of Chemistry, Sri Venkateswara University, Tirupati 517 502, India
,
C. Suresh Reddy
b   Department of Chemistry, Sri Venkateswara University, Tirupati 517 502, India
,
B. Sridhar
c   Laboratory of X-ray Crystallography, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India
› Author Affiliations
B. V. Subba Reddy*
a   Natural Product Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India, Email: basireddy@iict.res.in
,
Ch. Syama Sundar
a   Natural Product Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India, Email: basireddy@iict.res.in
b   Department of Chemistry, Sri Venkateswara University, Tirupati 517 502, India
,
M. Ramana Reddy
b   Department of Chemistry, Sri Venkateswara University, Tirupati 517 502, India
,
C. Suresh Reddy
b   Department of Chemistry, Sri Venkateswara University, Tirupati 517 502, India
,
B. Sridhar
c   Laboratory of X-ray Crystallography, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India
› Author Affiliations
Further Information

Publication History

Received: 26 September 2014

Accepted after revision: 20 January 2015

Publication Date:
27 February 2015 (online)


Abstract

Aldehydes and ketones undergo smooth coupling with (4E)-3-benzyl-5-phenylpent-4-en-1-ol in the presence of scandium(III) triflate (10 mol%) and 4-toluenesulfonic acid (30 mol%) to give the corresponding trans-fused hexahydro-1H-benzo[g]isochromenes in good yields with excellent selectivity. This is the first example of the synthesis of a trans-fused hexahydro-1H-benzo[g]isochromene derivatives from an aldehyde and (4E)-3-benzyl-5-phenylpent-4-en-1-ol through tandem Prins and Friedel–Crafts cyclizations.

Supporting Information