TY - JOUR
T1 - Total syntheses of natural products containing α-substituted α-amino acid structures from aldohexoses using overman rearrangement as the key reaction
AU - Sato, Hideyuki
AU - Oishi, Takeshi
AU - Chida, Noritaka
PY - 2004/7
Y1 - 2004/7
N2 - Recently, natural products containing highly functionalized α-substituted α-amino acid structures have been isolated and reported to show interesting biological properties such as neurotrophic, immunosuppressive, antifungal, and other activities. Efficient synthesis of these compounds, which are expected to be potent lead compounds for new drugs, is an important issue. In this article, development of the novel methodology for the synthesis of natural products in this class; rearrangement of allylic trichloroacetimidates (Overman rearrangement) on sugar scaffolds followed by further transformation of the rearranged products into highly functionalized α-substituted α-amino acid structures by use of the residual functionalities on sugars, is described. Overman rearrangement of imidates derived from aldohexofuranoses generated the tetrasubstituted carbon with nitrogen in a stereoselective manner. The rearranged products were efficiently converted into heterocyclic and acyclic natural products by conventional reactions. Based on this methodology, total syntheses of lactacystin, myriocin, and sphingofungin E starting from aldohexofuranoses have been achieved. Utilization of Overman rearrangement in natural product synthesis is also shortly reviewed.
AB - Recently, natural products containing highly functionalized α-substituted α-amino acid structures have been isolated and reported to show interesting biological properties such as neurotrophic, immunosuppressive, antifungal, and other activities. Efficient synthesis of these compounds, which are expected to be potent lead compounds for new drugs, is an important issue. In this article, development of the novel methodology for the synthesis of natural products in this class; rearrangement of allylic trichloroacetimidates (Overman rearrangement) on sugar scaffolds followed by further transformation of the rearranged products into highly functionalized α-substituted α-amino acid structures by use of the residual functionalities on sugars, is described. Overman rearrangement of imidates derived from aldohexofuranoses generated the tetrasubstituted carbon with nitrogen in a stereoselective manner. The rearranged products were efficiently converted into heterocyclic and acyclic natural products by conventional reactions. Based on this methodology, total syntheses of lactacystin, myriocin, and sphingofungin E starting from aldohexofuranoses have been achieved. Utilization of Overman rearrangement in natural product synthesis is also shortly reviewed.
KW - Aldohexoses
KW - Lactacystin
KW - Myriocin
KW - Overman rearrangement
KW - Sphingofungin E
KW - Total synthesis
KW - α-substituted α-amino acid
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U2 - 10.5059/yukigoseikyokaishi.62.693
DO - 10.5059/yukigoseikyokaishi.62.693
M3 - Review article
AN - SCOPUS:4644363546
VL - 62
SP - 693
EP - 704
JO - Yuki Gosei Kagaku Kyokaishi/Journal of Synthetic Organic Chemistry
JF - Yuki Gosei Kagaku Kyokaishi/Journal of Synthetic Organic Chemistry
SN - 0037-9980
IS - 7
ER -