## Abstract To test the eventual involvement of sterols with a cyclopropane containing side chain in bio‐methylation processes, 24,25‐methanocholest‐5‐en‐3β‐ol (**5**) and 24,25‐methano‐26‐methylcholest‐5‐en‐3β‐ol (**6**) were synthesized. Together with the naturally occurring cyclopropane petroste
Synthesis and Absolute Configuration of New Trichloro Steroids with Cyclopropane-Containing Side Chains
✍ Scribed by Robert W. Lang; Carl Djerassi; Phyllis D. Strong; Dale C. Swenson; William L. Duax
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- German
- Weight
- 372 KB
- Volume
- 64
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
The determination of the absolute configuration of the trichloro steroids 2a and 2c (cf. Scheme 1) by means of two X‐ray crystal structure analyses is reported and applies also to the determination of the absolute configurations of several derived steroidal cyclopropanes [1]. The preparation of the chlorinated derivatives 2a‐c is described and the spectroscopic properties of 1 and 2 are summarized.
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## Abstract A new method for the synthesis of steroids with oxygenated side chains starting from C~22~ steroids is described. Rieke copper, obtained by reduction of lithium 2‐thienylcyanocuprate 4 with lithium naphthalenide at −78°C or −100°C, reacts with the 22‐bromosteroids 1a, 2, 14 to afford th
## Abstract For Abstract see ChemInform Abstract in Full Text.
## Abstract A versatile system for preparing macrocyclic compounds with planar chirality is presented. In this system chiral diazacoronands are synthesized readily from lariat‐type diesters **13** and **14** and unsymmetrical diamines **7, 8, 12, 15**, and **16** under non‐high‐dilution conditions.