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Burger's Medicinal Chemistry, Drug Discovery and Development (7th edition)
Compendium of Organic Synthetic Methods
Comprehensive Organic Name Reactions and Reagents
Comprehensive Organic Synthesis (1991 edition)
Comprehensive Oganometallic Chemistry III (2007 edition)
e-EROS Encyclopedia of Reagents for Organic Synthesis
Greene's Protective Groups in Organic Synthesis 4th ed.
Organic Reaction Mechanisms
Patai's Chemistry of Functional Groups
Science of Synthesis : Houben-Weyl Methods of Molecular Transformations
SciFinder - web version (registration site)
Cold Spring Harbor Protocols
Current Protocols (Wiley InterScience)
Methods in Enzymology
SpringerNature Experiments (formerly Springer Protocols and BioMedProtocols)
Check out the Molecular and Cell Biology Guide.