Stereoselective Divergent Synthesis of Four Diastereomers of Pachastrissamine (Jaspine B)
摘要:
A divergent short synthesis of four diastereomers of pachastrissamine was achieved. Natural pachastrissamine was synthesized through bis-tosylation of the common intermediate and cyclization. 2-epi-Pachastrissamine was obtained by monotosylation and spontaneous cyclization of D-ribo-phytosphingosine derivative. By use of regio- and stereospecific ring-opening reaction of the orthoester assisted by a Bee group as a key step, 3-epi- and 2,3-epi-pachastrissamines were synthesized. The three stereogenic centers of all the diastereomers were constructed by using Garner's aldehyde as the sole chiral source.
Stereoselective Divergent Synthesis of Four Diastereomers of Pachastrissamine (Jaspine B)
摘要:
A divergent short synthesis of four diastereomers of pachastrissamine was achieved. Natural pachastrissamine was synthesized through bis-tosylation of the common intermediate and cyclization. 2-epi-Pachastrissamine was obtained by monotosylation and spontaneous cyclization of D-ribo-phytosphingosine derivative. By use of regio- and stereospecific ring-opening reaction of the orthoester assisted by a Bee group as a key step, 3-epi- and 2,3-epi-pachastrissamines were synthesized. The three stereogenic centers of all the diastereomers were constructed by using Garner's aldehyde as the sole chiral source.
A divergent short synthesis of four diastereomers of pachastrissamine was achieved. Natural pachastrissamine was synthesized through bis-tosylation of the common intermediate and cyclization. 2-epi-Pachastrissamine was obtained by monotosylation and spontaneous cyclization of D-ribo-phytosphingosine derivative. By use of regio- and stereospecific ring-opening reaction of the orthoester assisted by a Bee group as a key step, 3-epi- and 2,3-epi-pachastrissamines were synthesized. The three stereogenic centers of all the diastereomers were constructed by using Garner's aldehyde as the sole chiral source.