The enantioselective synthesis of FD-891 has been achieved with a longest linear sequence of 21 steps. The synthetic strategy involves the use of aldol additions of a chlorotitanium enolate of N-acylthiazolidinethiones as the key reaction to establish 6 of the 10 stereogenic centers. A key cross-metathesis and a late-stage Julia olefination serve to assemble three key subunits.
Total synthesis of calyculin A–construction of the C(9)–C(37) fragment
摘要:
The potent protein phosphatase inhibitor calyculin A is formally synthesized via construction of the C(9)-C(37) fragment 2 by a Wittig reaction of the C(9)-C(25) spiroketal fragment with the C(26)-C(37) phosphonium salt.
The enantioselective synthesis of FD-891 has been achieved with a longest linear sequence of 21 steps. The synthetic strategy involves the use of aldol additions of a chlorotitanium enolate of N-acylthiazolidinethiones as the key reaction to establish 6 of the 10 stereogenic centers. A key cross-metathesis and a late-stage Julia olefination serve to assemble three key subunits.
Total synthesis of calyculin A–construction of the C(9)–C(37) fragment
The potent protein phosphatase inhibitor calyculin A is formally synthesized via construction of the C(9)-C(37) fragment 2 by a Wittig reaction of the C(9)-C(25) spiroketal fragment with the C(26)-C(37) phosphonium salt.