S. No.

Entry

R₁

R₂

R₃

R₄

R₅

R₆

9 Yield (%)^a

1

a

H

OH

H

H

H

H

88

2

b

H

OH

H

OCH₃

H

H

89

3

c

H

OH

H

H

OCH₃

H

90

4

d

H

OH

H

H

OH

H

88

5

e

H

OH

OCH₃

H

OCH₃

H

89

6

f

OH

OH

H

H

H

H

75, 89^b

7

g

OH

OH

H

OCH₃

H

H

70, 85^b

8

h

OH

OH

H

H

OCH₃

H

75, 90^b