Fig. 6

Comparison between the synthesis of 3 from 1 and that from 5. a Synthesis of 3 using a one-pot cyclization-deprotection from 5. b Synthesis of 3 from the cyclization of 1 and 2. c Comparison between Route 1 and Route 2
Comparison between the synthesis of 3 from 1 and that from 5. a Synthesis of 3 using a one-pot cyclization-deprotection from 5. b Synthesis of 3 from the cyclization of 1 and 2. c Comparison between Route 1 and Route 2