Synlett 2018; 29(01): 131-135
DOI: 10.1055/s-0036-1588541
letter
© Georg Thieme Verlag Stuttgart · New York

Photoinduced Regioselective Lactonization of ortho-Iodobenzoic Acids with Alkenes: Synthesis of 3,4-Dihydroisocoumarin Derivatives

Xiao Zhang
State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen 518005, P. R. of China   Email: xyyang@hit.edu.cn   Email: xiawj@hit.edu.cn
,
Binbin Huang
State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen 518005, P. R. of China   Email: xyyang@hit.edu.cn   Email: xiawj@hit.edu.cn
,
Chao Yang*
State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen 518005, P. R. of China   Email: xyyang@hit.edu.cn   Email: xiawj@hit.edu.cn
,
State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen 518005, P. R. of China   Email: xyyang@hit.edu.cn   Email: xiawj@hit.edu.cn
› Author Affiliations
We are grateful for financial support from China NSFC (Nos. 21372055, 21472030 and 21672047) and SKLUWRE (No. 2017DX03).
Further Information

Publication History

Received: 12 June 2017

Accepted after revision: 18 July 2017

Publication Date:
22 August 2017 (online)


Abstract

A photoinduced strategy for the synthesis of a variety of 3,4-dihydroisocoumarins has been realized. The reactions proceeded from ortho-iodobenzoic acids and alkenes through a photodehalogenative lactonization with NaHCO3 as the only additive in dimethyl sulfoxide (DMSO) to provide the desired products in moderate to good yields. This method offers a simple, mild, and environmentally friendly route to 3,4-dihydroisocoumarin derivatives.

Supporting Information

 
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  • 13 A mixture of 2-iodo-5-methylbenzoic acid (2a; 0.2 mmol, 1 equiv), styrene 1a (0.8 mmol, 4 equiv) and NaHCO3 (0.26 mmol, 1.3 equiv) in DMSO (4 mL) was put into a quartz reaction tube (10 mL). N2 was flowed in for 10 min, then the tube was sealed and exposed to illumination with a high-pressure mercury lamp at 300 nm wavelength for 6 h. Water (20 mL) was added to the reaction system and the mixture was extracted with ethyl acetate (3 × 20 mL). The organic phase was washed with saturated salt water, dried with anhydrous sodium sulfate, and the crude products were obtained under reduced pressure and concentration. The purified products were purified by silica gel column chromatography (PE/EtOAc, 10:1), and the product 7-methyl-3-phenylisochroman-1-one 3a (75%) was obtained as a pale-yellow liquid. 1H NMR (400 MHz, CDCl3): δ = 7.97 (s, 1 H), 7.52–7.33 (m, 6 H), 7.17 (d, J = 7.7 Hz, 1 H), 5.53 (dd, J = 12.0, 3.2 Hz, 1 H), 3.29 (dd, J = 16.3, 12.0 Hz, 1 H), 3.10 (dd, J = 16.4, 3.2 Hz, 1 H), 2.41 (s, 3 H). 13C NMR (151 MHz, CDCl3): δ = 165.6, 138.6, 137.7, 135.0, 134.8, 130.6, 128.6, 128.6, 127.2, 126.1, 124.8, 80.0, 35.2, 21.0. HRMS (ESI): m/z [M + H]+ calcd for C16H15O2: 239.1067; found: 239.1066.