Abstract: This invention relates to compounds which are alpha-1 receptor agonists, preferably alpha-1A/L receptor agonists, and which are represented by Formula I: wherein X is —S(O)n— or —C(O)—, A is C1-6alkyl, aryl, heteroaryl, hydroxyalkyl, or —(CH2)p—NRaRb, and the other substituents are as defined in the specification; or individual isomers, racemic or non-racemic mixtures of isomers, or pharmaceutically acceptable salts or solvates thereof. The invention further relates to pharmaceutical compositions containing such compounds, methods for their use as therapeutic agents, and methods of preparation thereof.

Abstract: This invention relates to 1,3-dihydroxy-20,20-dialkyl-vitamin D3 analogs of Formula (I): compositions comprising the analogs, methods of preparing the analogs and methods of treatment of osteoporosis, secondary hyperparathyroidism, cancer and autoimmune diseases using such analogs.