Effect of 11β-substituents on the regioselective chlorination of estrogens with 2,3,4,5,6,6-hexachloro-2,4-cyclohexadienone
摘要:
The reaction of 11 beta-substituted estrogens with 2,3,4,5,6,6-hexachloro-2,4-cyclohexadienone affords exclusively ortho-substituted monochlorinated products including a major 4-chloro and a minor 2-chloro derivative. In the absence of an 11 beta-substituent, regioselectivity is lost, resulting in a mixture of 10 beta- and ortho-chlorinated products.