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Syntheses and CD studies of 5α-cholesteno[3,2-d]-, -[2,3-d]- and -[3,4-d]pyrimidines

✍ Scribed by Hasan, Mashooda ;Rashid, Naghmana ;Khan, Khalid Mohammed ;Snatzke, Günther ;Duddeck, Helmut ;Voelter, Wolfgang

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
857 KB
Volume
1995
Category
Article
ISSN
0947-3440

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✦ Synopsis

and [3,4-d]

pyrimidines (15a) have been achieved by using hydroxymethylene derivatives of relevant cholestanones prepared from cholesterol (1). Their CD spectra exhibit at least three Cotton effects between 300 to 200 nm, a first CD band around 290, a second one around 260 and a third one around 220 nm. A quadrant rule is developed and applied to the determination of the sign of the first CD band, while a helicity rule is applicable to the third CD band. The first band is positive in the [3,2-d] series, whereas it is negative in the [2,3d ] and the [3,4-d] series. The third band is negative in all three series.

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