There is provided SHC/HAC derivatives, amino acid sequences comprising the SHC/HAC derivatives, nucleotide sequences encoding the SHC/HAC derivatives, vectors comprising nucleotide sequences encoding the SHC/HAC derivatives, recombinant host cells comprising nucleotide sequences encoding the SHC/HAC derivatives and applications of the recombinant host cells comprising either SHC/HAC derivatives or WT SHC/HAC enzymes in methods to prepare (−)-Ambrox and SHC/HAC enzymes in methods to prepare (−)-Ambrox.

Disclosed are a tetrahydronaphtho[1,2-b]furan-2(3H)-one derivative of formula (I) and a method of making the same, where definitions of R, R.sub.1 and R.sub.2 herein are the same as those in the specification. It has been demonstrated by animal experiments that the tetrahydronaphtho[1,2-b]furan-2(3H)-one derivative can significantly inhibit the adjuvant-induced in Wistar male rats so that it can alleviate the primary and secondary lesions, showing a preventive activity to some extent. Therefore, the tetrahydronaphtho[1,2-b]furan-2(3H)-one derivative provided herein is applicable to the preparation of a drug for preventing/treating rheumatoid arthritis, and has promising clinical applications. ##STR00001##

The present invention relates to the composition and method of use of Stat3 pathway inhibitors or cancer stem cell inhibitors in combination treatment of cancer.

The present invention relates to the composition and method of use of Stat3 pathway inhibitors or cancer stem cell inhibitors in combination treatment of cancer.

Compounds of Formula I and the pharmaceutically acceptable salts thereof are disclosed

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The variables X.sup.1, X.sup.2, and R.sup.1-4 are disclosed herein. The compounds are useful for treating cancer and related proliferative diseases. Pharmaceutical compositions containing compounds of Formula I and methods of treatment comprising administering compounds of Formula I are also disclosed.

Compounds of Formula I and the pharmaceutically acceptable salts thereof are disclosed

##STR00001##

The variables X.sup.1, X.sup.2, and R.sup.1-4 are disclosed herein. The compounds are useful for treating cancer and related proliferative diseases. Pharmaceutical compositions containing compounds of Formula I and methods of treatment comprising administering compounds of Formula I are also disclosed.

There is provided SHC/HAC derivatives, amino acid sequences comprising the SHC/HAC derivatives, nucleotide sequences encoding the SHC/HAC derivatives, vectors comprising nucleotide sequences encoding the SHC/HAC derivatives, recombinant host cells comprising nucleotide sequences encoding the SHC/HAC derivatives and applications of the recombinant host cells comprising either SHC/HAC derivatives or WT SHC/HAC enzymes in methods to prepare (−)-Ambrox and SHC/HAC enzymes in methods to prepare (−)-Ambrox.

There is provided SHC/HAC derivatives, amino acid sequences comprising the SHC/HAC derivatives, nucleotide sequences encoding the SHC/HAC derivatives, vectors comprising nucleotide sequences encoding the SHC/HAC derivatives, recombinant host cells comprising nucleotide sequences encoding the SHC/HAC derivatives and applications of the recombinant host cells comprising either SHC/HAC derivatives or WT SHC/HAC enzymes in methods to prepare (−)-Ambrox and SHC/HAC enzymes in methods to prepare (−)-Ambrox.

Provided herein are methods of preparation of I by reacting i with acid where R.sub.1 and R.sub.2 are each independently a leaving group. Intermediates to make i are also claimed.

##STR00001##

Provided herein are methods of preparation of I by reacting i with acid where R.sub.1 and R.sub.2 are each independently a leaving group. Intermediates to make i are also claimed.

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