Crystal structures and absolute stereochemistry of tecomanine methoperchlorate and ‘alkaloid C’ methiodide: two monoterpene alkaloids from Tecoma stans
- 1 January 1975
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 10,p. 1124-1128
- https://doi.org/10.1039/p29750001124
Abstract
Crystals of tecomanine methoperchlorate are monoclinic, a= 8.032(1), b= 10.019(1), c= 8.900(2)Å, β= 91.44(1)°, Z= 2, space group P21; crystals of ‘alkaloid C’ methiodide are orthorhombic, a= 8.874(1), b= 9.361(1), c= 16.861(2), Z= 4, space group P212121. Both structures were determined from Patterson and Fourier synthesis, and refined by full-matrix and block-diagonal least-squares to R 0.047 (1305 observed reflexions, tecomanine methoperchlorate) and 0.049 (1412 observed reflexions, ‘alkaloid C’ methiodide). The two structures have identical absolute stereochemistry at their common asymmetric centres, and in each case the six-membered ring is in the chair, and the five-membered ring in the envelope confirmation.Keywords
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