Confirmation of the Connectivity of 4,8,12,16,20-Pentamethylpentacosylphoshoryl β-d-Mannopyranoside, an Unusual β-Mannosyl Phosphoisoprenoid from Mycobacterium avium, through Synthesis
摘要:
The synthesis of the title glycolipid is reported. Comparison of the electrospray and high-energy collision-induced dissociation mass spectra of the synthetic material with those reported for the isolate confirm the structure of this unusual antigenic substance with its modified isoprenoid chain.
Confirmation of the Connectivity of 4,8,12,16,20-Pentamethylpentacosylphoshoryl β-d-Mannopyranoside, an Unusual β-Mannosyl Phosphoisoprenoid from Mycobacterium avium, through Synthesis
摘要:
The synthesis of the title glycolipid is reported. Comparison of the electrospray and high-energy collision-induced dissociation mass spectra of the synthetic material with those reported for the isolate confirm the structure of this unusual antigenic substance with its modified isoprenoid chain.
A diastereoselective hydride transfer process has been developed under Brønsted acid-catalyzed reaction conditions using methyl ethers or acetals as hydride donors and tertiary alcohols or alkenes as precursors of carbocation. The method enables construction of complexmolecules having multiple stereogenic centers from rather simple and readily available starting materials with predictable diastereoselective