Absolute configuration of phytocassanes as proposed on the basis of the CD spectrum of synthetic (+)-2-deoxyphytocassane A

Tetrahedron Letters

Volumn 41, Issue 3, 2000, Pages 351-354

  Yajima, Arata ^a   Mori, Kenji ^a  

^a TOKYO UNIVERSITY OF SCIENCE   (Japan)

Author keywords

Circular dichroism; Configuration; Phytoalexins; Terpenes; Terpenoids

Indexed keywords

PHYTOALEXIN; TERPENE; TERPENOID;

ARTICLE; CHEMICAL ANALYSIS; CHEMICAL STRUCTURE; CIRCULAR DICHROISM; CONFORMATION; SPECTROSCOPY; STRUCTURE ANALYSIS; SYNTHESIS;

EID: 0034650864     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4039(99)02060-2     Document Type: Article

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16. 2: calcd 300.2088; found: 300.2094. The protons of C-17 methyl group attached at C-14 of 6 absorbed at δ=1.06, while the same methyl group at C-14 of 15 appeared at δ=0.63 and 0.81. This may be due to the fact that C-17 methyl group of 6 is located near the conjugated dienone system and thereby much more deshielded in comparison to the methyl group of 15.
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18. Synthetic methods for 18-21 will be reported in the full paper.