By Geoffrey A. Cordell
This sequence is world-renowned because the major compilation of present studies of this massive box. the world over acclaimed for greater than forty years, The Alkaloids: Chemistry and Biology, based via the past due Professor R.H.F. Manske, maintains to supply notable assurance of this swiftly increasing box. each one quantity offers, via its wonderful authors, updated and exact assurance of specific periods or resources of alkaloids.
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Extra info for The Alkaloids: Chemistry and Biology, Vol. 65
Sample text
In 1996, Wu et al. reported the isolation of clausine A (71) from the methanol extract of the stem bark of C. excavata (51). 11), which indicated a 3-formyl-2-hydroxycarbazole framework. 42 for the NH and OH group, respectively. 44). 68, assigned to H-7, H-6, and H-5 at the C-ring of the carbazole nucleus. 99) was concluded to be at C-8. 15). Three years later, Wu et al. reported the isolation of clausine O (72) from the acetone extract of the root bark of C. excavata (43). The UV spectrum [lmax 223, 240, 252 (sh), 291 (sh), 301, 321 (sh), and 340 nm] and the IR spectrum (nmax 1620, 3330 and 3375 cmÀ1) of clausine O indicated a 3-formylcarbazole framework with a chelated hydroxy group.
Excavata (43). The UV spectrum [lmax 219, 239 (sh), 249, 283, and 318 (sh) nm] and the IR spectrum [nmax 1610 (aromatic system), 1690 (carbomethoxy), 3330 (OH), and 3375 (NH) cmÀ1] of clausine M (102) were similar to those of clausine C (101), indicating a 3-carbomethoxycarbazole framework. 51 instead of the methoxy signal. The presence of a hydroxy group was supported by the IR band at 3330 cmÀ1. The spectroscopic data led to structure 102 for clausine M. This structural assignment was additionally supported by NOE experiments (43).
In 1999, Wu et al. described the isolation and structural elucidation of clausine M (102) and clausine N (103) from the acetone extract of the root bark of C. excavata (43). The UV spectrum [lmax 219, 239 (sh), 249, 283, and 318 (sh) nm] and the IR spectrum [nmax 1610 (aromatic system), 1690 (carbomethoxy), 3330 (OH), and 3375 (NH) cmÀ1] of clausine M (102) were similar to those of clausine C (101), indicating a 3-carbomethoxycarbazole framework. 51 instead of the methoxy signal. The presence of a hydroxy group was supported by the IR band at 3330 cmÀ1.